Electric equipment safety device

Abstract

The invented equipment is capable of monitoring ground wire, hot wire and zero line fully, preventing reverse connection between hot wire and zero line, automatic resetting, possible to be enbended into diversified electric apparatus, and overcoming disadvantages in current technique. The equipment includes switching circuit, rectifying circuit and relay. Hot wire and zero line connected to power source through rectifying circuit, switching circuit provides power for the relay. After being connected to the relay, then the hot wire, zero line and ground wire are connected to electric apparatus. Based on / off state of ground wire, the switching circuit controls on / off of power source. Monitoring end of the switching circuit is connected to ground wire. The rectifying circuit is utilized to rectify electrical source for supplying power for the relay, which controls on / off of hot wire, zero line and ground wire.

Description

technical field [0001] The invention relates to the field of electrical equipment safety protection devices, and more specifically relates to an electrical equipment safety device. technical background [0002] The existing general power supply system basically uses three-wire access, the live wire and the neutral wire are used for power supply, and the ground wire plays a role in protecting users from electric shock hazards. With the popularization and use of various large-scale electrical equipment today, people pay more and more attention to the safe use of electricity, and the safety protection devices for electrical equipment are also gradually developed. More traditional mode in the prior art has fuse, safety switch, short-circuit switch and the safety protection device that is installed in the electrical equipment. Although the fuse is simple in structure and low in cost, it has been gradually withdrawn from the market due to its relativel...

AI Technical Summary

Problems solved by technology

Although the fuse is simple in structure and low in cost, it has been gradually withdrawn from the market due to its relatively rough safety performance and slow response, which has little protection for users and electrical equipment; The safety of the equipment or the user who uses the equipment has almost no effect on the safety protection of the power grid; in the prior art, various safety switches and short-circuit switches are widely used. Such safety devices are sensitive in response and can control their The entire power grid under the jurisdiction has a complex structure, high cost, and large volume. Generally, only one or several such safety devices are installed in a relatively large power unit network, and it can only be controlled from a relatively large range. The safety of the power grid; safety devices such as safety switches and short-circuit switches are generally aimed at the danger of electric shock to users caused by the live wire and neutral wire in the power grid, but it is impossible to monitor the hidden danger to users caused by whether the ground wire is connected. , in the process of wiring or installation, it can be used normally even if the grounding wire is not connected, so this kind of safety device still has certain safety hazards; the above types of safety devices also have the following disadvantages at the same time, because most of the current grid It is an AC power grid. When the live wire and the neutral wire are swapped and connected, such safety devices can be used normally, causing great danger to users and electrical equipment. Generally, such safety devices are used to monitor a certain range of power grids or a For electrical equipment, when there is a problem with the power grid or electrical equipment, the power supply will be disconnected, which plays a role in safety protection, but it cannot help users to confirm which section of the power network or which electrical equipment has a problem, which is not conducive to Maintenance; the adjustable performance of this kind of safety device is poor, the user cannot control the sensitivity of its response, and can only choose safety devices with different sensitivities according to different needs; and after the fault is eliminated, such safety devices generally need manual reset before they can be connected power line

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